permafrost

Fresh U.S. government data spotlighting the rapid growth of atmospheric methane concentrations in recent years has scientists increasingly concerned that the human-caused climate crisis has triggered a vicious feedback loop, potentially resulting in unstoppable planetary warming. Research published in January by the National Oceanic and Atmospheric Administration (NOAA) showed that atmospheric concentrations of methane—a greenhouse gas that's 80 times more potent than carbon dioxide over a 20-year period—soared past 1,900 parts per billion in 2021, which ranked as the fourth-warmest year on record. As Nature reported Tuesday, "The growth of methane emissions slowed around the turn of the millennium, but began a rapid and mysterious uptick around 2007."